This Standard specifies the signalling protocol for the support
of the Wireless Terminal Authentication supplementary services
(SS-WTAT and SS-WTAN) at the Q reference point between Private
Integrated services Network eXchanges (PINXs) connected together
within a Private Integrated Services Network (PISN).

Authentication of a WTM user (SS-WTAT) is a supplementary service
that enables a PISN, as a security measure, to validate the identity
provided by the WTM user.

Authentication of the PISN (SS-WTAN) is a supplementary service
that enables a served WTM user, as a security measure, to validate
the identity of the PISN.

The mechanisms used in these services are based on the challenge
and response method of authentication.

Authentication algorithms to be used by these supplementary services
are outside the scope of this Standard.